Hi, although it's a common sense and most of us already knew it, I still put it here as a reminder.

Yoyo is a place for people to improve their English; we want our English better and more correct. If you find any possible mistakes here, please kindly help us to correct them. We appreciate your help and will be thankful to it.

In matters of style, swim with the current; in matters of principle, stand like a rock.